Android中可以通過webview來實現和js的交互,在程序中調用js代碼,只需要將webview控件的支持js的屬性設置為true
Android(Java)與JavaScript(HTML)交互有四種情況:
1) Android(Java)調用HTML中js代碼
2) Android(Java)調用HTML中js代碼(帶參數)
3) HTML中js調用Android(Java)代碼
4) HTML中js調用Android(Java)代碼(帶參數)
下面示例總結這四種情況,直接上干貨:
1) Android(Java)
private void showWebView(){ // webView與js交互代碼 try { mWebView = new WebView(this); setContentView(mWebView); mWebView.requestFocus(); mWebView.setWebChromeClient(new WebChromeClient(){ @Override public void onProgressChanged(WebView view, int progress){ JSAndroidActivity.this.setTitle("Loading..."); JSAndroidActivity.this.setProgress(progress); if(progress >= 80) { JSAndroidActivity.this.setTitle("JsAndroid Test"); } } }); mWebView.setOnKeyListener(new View.OnKeyListener() { // webview can go back @Override public boolean onKey(View v, int keyCode, KeyEvent event) { if(keyCode == KeyEvent.KEYCODE_BACK && mWebView.canGoBack()) { mWebView.goBack(); return true; } return false; } }); WebSettings webSettings = mWebView.getSettings(); webSettings.setJavaScriptEnabled(true); webSettings.setDefaultTextEncodingName("utf-8"); mWebView.addJavascriptInterface(getHtmlObject(), "jsObj"); mWebView.loadUrl("http://192.168.1.121:8080/jsandroid/index.html"); } catch (Exception e) { e.printStackTrace(); } } private Object getHtmlObject(){ Object insertObj = new Object(){ public String HtmlcallJava(){ return "Html call Java"; } public String HtmlcallJava2(final String param){ return "Html call Java : " + param; } public void JavacallHtml(){ runOnUiThread(new Runnable() { @Override public void run() { mWebView.loadUrl("javascript: showFromHtml()"); Toast.makeText(JSAndroidActivity.this, "clickBtn", Toast.LENGTH_SHORT).show(); } }); } public void JavacallHtml2(){ runOnUiThread(new Runnable() { @Override public void run() { mWebView.loadUrl("javascript: showFromHtml2('IT-homer blog')"); Toast.makeText(JSAndroidActivity.this, "clickBtn2", Toast.LENGTH_SHORT).show(); } }); } }; return insertObj; }
2) js(HTML)
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <!-- saved from url=(0032)http://localhost:8080/jsandroid/ --> <html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <meta http-equiv="Expires" content="0"> <meta http-equiv="Pragma" content="no-cache"> <meta http-equiv="Cache-Control" content="no-store,no-cache"> <meta name="Handheldfriendly" content="true"> <meta name="viewport" content="width=100%; initial-scale=1.0; user-scalable=yes"> <meta name="robots" content="all"> <meta name="keywords" contect="doodle, mobile, doodlemobile, game, games"> <meta name="description" content="Make People's Mobile Life More Connected Through Games."> <title>jsandroid_test</title> <script type="text/javascript" language="javascript"> function showHtmlcallJava(){ var str = window.jsObj.HtmlcallJava(); alert(str); } function showHtmlcallJava2(){ var str = window.jsObj.HtmlcallJava2("IT-homer blog"); alert(str); } function showFromHtml(){ document.getElementById("id_input").value = "Java call Html"; } function showFromHtml2( param ){ document.getElementById("id_input2").value = "Java call Html : " + param; } </script> </head> <body> hello IT-homer <br> <br> <br> <input type="button" value="HtmlcallJava" onclick="showHtmlcallJava()" /> <br> <input type="button" value="HtmlcallJava2" onclick="showHtmlcallJava2()" /> <br> <br> <br> <br> <input id="id_input" style="width: 90%" type="text" value="null" /> <br> <input type="button" value="JavacallHtml" onclick="window.jsObj.JavacallHtml()" /> <br> <br> <br> <input id="id_input2" style="width: 90%" type="text" value="null" /> <br> <input type="button" value="JavacallHtml2" onclick="window.jsObj.JavacallHtml2()" /> </body> </html>
3) 運行結果:
4) 代碼解析:
(1) 允許Android執行js腳本設置
Android(Java)與js(HTML)交互的接口函數是: mWebView.addJavascriptInterface(getHtmlObject(), "jsObj"); // jsObj 為橋連對象
Android容許執行js腳本需要設置:webSettings.setJavaScriptEnabled(true);
(2) js(HTML)訪問Android(Java)代碼
js(HTML)訪問Android(Java)端代碼是通過jsObj對象實現的,調用jsObj對象中的函數,如:window.jsObj.HtmlcallJava()
(3) Android(Java)訪問js(HTML)代碼
Android(Java)訪問js(HTML)端代碼是通過loadUrl函數實現的,訪問格式如:mWebView.loadUrl("javascript: showFromHtml()");
說明:
1) Android訪問url網址,需在AndroidManifest.xml文件,配置容許訪問網絡的權限:
<uses-permission android:name="
android.permission.INTERNET
" />
2) Android(Java)調用js(HTML)時,使用的mWebView.loadUrl("javascript: showFromHtml()");函數需在UI線程運行,因為mWebView為UI控件
public void JavacallHtml(){ runOnUiThread(new Runnable() { @Override public void run() { mWebView.loadUrl("javascript: showFromHtml()"); Toast.makeText(JSAndroidActivity.this, "clickBtn", Toast.LENGTH_SHORT).show(); } }); }
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